The forces that destroyed the protection around the material plane and allowed the Invasion also weakened the barrier between the world and the Feywild.  As a result, the cities of the eladrin began to appear in remote parts of the world.

Proud, strong, and honorable to a fault, the dragonborn live in the foothills and mountains in the far north of the world.  With the help of their dragon elders, they are engaged in an endless struggle to keep the Invaders from their lands.

Prerequisites: Aasimar
Benefit: You gain a +1 bonus to attacks against Devils and Demons.

(NB: This is a Work in Progress... it has not been fully considered for mechanical balance, and will change)

Aasimar are the mortal descendents of celestials.  Hunted nearly to extinction by the Invaders, they must disguise their heritage to survive.

All of the information for 4th edition is collected here. There might not be much here for a while.